Process of making winged caps.



0. ZERK.

PROCESS OF MAKING WINGED CAPS.

APPLICATION FILED AUG-5| 1913.

Patented July 10, 1917.

v n/VE/V OSCAR ZERK, OF CLEVELAND, OHIO, A-SSIGNOR TO THE ZERK MANUFACTURING COM- PANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

messes.

Application filed August 5, 1913.

To all whom it may concern:

Be it known that I, OSCAR ZERK, a subject of the Emperor of Austria, residing a Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Processes of Making WVinged Caps, of which the following is a full, clear, and eXact description, reference being had to the accompanying drawings.

The object of this invention is to provide a very cheap and at the same time eflicient winged cap. Such caps when internally threaded, are very useful in grease cups, for example. I make my cap by stamping it from'a single piece of sheet metal. The cap is first formed into a thimble shape having a domed top. The top is then flattened to make a central rounded wing, and this wing is then squared on its top and side edges and reduced in width. The cap then has its wall externally knurled and internally threaded. The wing, by reason of its Square corners furnishes very effective means for turning the cap where considerable force is desired. The nurling provides for rapidly turning it in case only slight force is necessary. My process saves the expense of making the wing of a separate piece and securing it to the top of the cap.

The drawings illustrate various steps of the process, as well as the finished article. Figure 1 is a side elevation of the thimble shaped blank; Fig. 2 is a side elevation of the same after the preliminary wing has been formed by stamping together the dome portion of the cap; Fig. 3 is a section of the cap having this preliminary wing; Fig. 4 is a side elevation of the cap after the final wing has been formed; Fig. 5 is a section of the cap shown in Fig. 4; Fig. 6 is a side elevation of the finished cap.

A, in Fig. 1, is a thimble-like cap having a cylindrical part 1, and a dome 2, made by a continuous wall 3. This blank may be made by any suitable means, as, for example, stamping in one or more steps from a sheet metal disk.

Figs. 2 and 3 indicate the cap after the step of bending in the dome portion has been performed. In these views the cap B has a cylindrical wall 4, a comparatively flattened top portion 5, and a wing 6 formed with the metal doubled on itself into contact and having a continuously rounded edge as shown at 7.

Specification of Letters Patent.

Patented July 10, 1917. Serial No. 783,063.

The cap B shown in Figs. 2 and 3 is then submitted to dies, which press the preliminary wing downwardly at its top and in wardly at its ends, while holding it at the sides against spreading, thus bringing the cap into the form shown by C in Figs. 4 and 5. In these views the cap has the cylindrical wall 8, the flattened top 9, and the wing 10, which is straight across its top at 11 and straight at its ends at 12, and has fiat sides, the sides merging by suitable curves 13 with the top 9. The flat ends also merge by small. curves 14: with the top.

By making the ends 12 of the wing to stand within the enveloping cylinder of the cap, I have ample room for nurling the exterior, if desired. The cap so knurled is shown at D, in Fig. 6, where 15 indicates the former cylindrical wall of the cap, 16 nurling near the upper edge, 17 a groove sepa.

rating the nurling from the smooth cylindrical portion. Above the nurling is the wing 18 of the form shown in Figs. 4 and 5. The cap is internally threaded, as indicated at 19, and may be provided at its lower edge with one or more notches 20 to coact with a suitable lock device.

It will be seen that my process may be very simply and cheaply carried out and but few operations are required. When completed, a cap of very attractive appear ance is produced and one which is very strong and has an effective wing of the desired shape.

Having thus described my invention, what I claim is:

1. The process of making winged caps consisting of pressing the upper portion of the cap together to make a rounded wing, and thereafter squaring said wing.

2. The process of making winged caps consisting of taking a thimble-shaped blank with a domed top, compressing together the domed portion to make a central rounded wing, and thereafter squaring said wing.

3. The process of making winged caps consisting of stamping from sheet metal a cap with its upper portion compressed together to make a central wing with a round contour, and thereafter pressing the top and side edges of said wing to square the top and narrow the width of the wing.

4.. The process of making winged caps consisting of taking a thimble-like blank with a dome top, compressing together such top to make a central doubled rounded wing, and thereafter pressing downwardly on the top of the wing and inwardly on the side edges thereof.

5. The process of making winged caps consisting of taking a thimble-like blank, compressing together the upper portion thereof to make a closed doubled rounded central wing, and thereafter submitting the wing to pressure on its top edge and side edges while holdingits side faces, whereby thewing is changed into the squaredform shown. v

6, The process of making a winged cap consisting of compressing together the upper portion ofa thimble like blank to make a rounded wing extending along a diameter, thereafter compressing in the side edges and the top of the blank to straighten the upper edge of the wing,substantially as and for the purpose set forth. 7

7. The process of making winged caps consisting of compressing together the upper portion of a thimble-like blank to make a rounded wing, and thereafter bringing in the side edges of the wing to narrow the width thereof and then nurling the outer side of the body beyond the ends of the wing.

S. The process of making winged caps consisting of taking a thimble-like blank with a dome-top compressing together the sides of the top to make a doubled closed rounded wing, then submitting such wing to pressure on its top and side edges while holding its side faces, whereby the wing is brought into a squared form of less width than the diameter of the cap and thereafter nurling the exterior of the cap beyond the ends of the wing.

In testimony whereof, I hereunto aflix my signature in the presence of two witnesses.

OSCAR ZERK. Witnesses ALBERT H. Barns, BRENNAN B. VVnsT.

: Copies of thispatent may be obtained for five cents each, by addressing the Commissioner of Eatents,

' Washington, D. G. 

